Oriented silicon steel capable of reducing surface hardness and preparation method thereof

The invention relates to oriented silicon steel capable of reducing surface hardness. The oriented silicon steel comprises, by weight, components of 0.015%-0.095% of C, 2.80%-3.60% of Si, 0.020%-0.035% of Als, 0.0050%-0.0100% of N, 0.010%-1.00% of Mn and 0.0030%-0.03% of S. The preparation method comprises steps of casting into a blank after smelting; performing low-temperature or high-temperaturehot rolling; coiling after conventional cooling; primary cold rolling; decarburizing and annealing; nitriding treatment; coating high-temperature annealing separant to remove a magnesium silicate bottom layer; carrying out high-temperature annealing by adopting a secondary heat preservation mode; stretching, flattening and annealing; and coating semi-organic insulating coating and conventionallydrying. The oriented silicon steel is advantaged in that on the premise that the magnetic induction intensity B800 is larger than or equal to 1.83 T and the magnetic induction intensity P17 is smallerthan or equal to 1.50 W/kg